Position Detecting System and Driving Method Thereof

1. A position detecting system, comprising: a display panel including a plurality of pixels; a backlight unit including a first light emitting unit and a second light emitting unit; a data driving unit configured to apply a first data voltage and a second data voltage to the plurality of pixels of the display panel, wherein the display panel is configured to display an image based on the first data voltage during a first frame and the display panel is further configured to display patterns based on the second data voltage during a second frame; and a position detecting sensor configured to capture an image of the patterns displayed by the display panel during the second frame, wherein the first light emitting unit is turned on and the second light emitting unit is turned off during the first frame, and the image is displayed on the display panel during the first frame using the first light emitting unit, wherein the second light emitting unit is configured to supply either visible light or invisible light to the display panel, and wherein the first light emitting unit is turned off and the second light emitting unit is turned on during the second frame, and the patterns are displayed on the display panel during the second frame by changing grays of the plurality of pixels using only the visible light or the invisible light of the second light emitting unit.

2. The position detecting system of claim 1 , wherein the first light emitting unit is a visible light emitting unit configured to supply visible light to the display panel.

3. The position detecting system of claim 2 , wherein: when the position detecting mode is turned off: the data driving unit is configured to apply the first data voltage to the display panel, and the visible light emitting unit is configured to supply the visible light to the display panel.

4. The position detecting system of claim 2 , wherein: the visible light emitting unit is configured to supply the visible light to the display panel during a portion of the second frame when the second data voltage is being applied to the display panel during the second frame.

5. The position detecting system of claim 4 , wherein: the visible light emitting unit is configured to supply the visible light to the display panel during the first frame when the first data voltage is being applied to the display panel during the first frame.

6. The position detecting system of claim 5 , wherein: the position detecting sensor includes a camera configured to capture a portion of the image of the patterns, wherein a position of the camera within the position detecting sensor changes depending on a contact pressure applied to the position detecting sensor.

7. The position detecting system of claim 3 , wherein: the position detecting sensor includes a light source configured to emit the visible light towards the display panel, and a camera configured to capture a portion of the visible light reflected from the display panel, wherein the portion of the reflected light is used to form the image of the patterns.

8. The position detecting system of claim 7 , wherein: the visible light emitting unit is turned off during the second frame when the second data voltage is applied to the display panel during the second frame, and the visible light emitting unit is turned on during the first frame when the first data voltage is applied to the display panel during the first frame.

9. The position detecting system of claim 8 , wherein: the camera is configured to capture a portion of the image of the patterns, wherein a position of the camera within the position detecting sensor changes depending on a contact pressure applied to the position detecting sensor.

10. The position detecting system of claim 2 , wherein: the second light emitting unit is an infrared light emitting unit configured to supply infrared light to the display panel.

11. The position detecting system of claim 10 , wherein: the infrared light emitting unit is configured to emit the infrared light when the second data voltage is applied to the display panel during the second frame, and the visible light emitting unit is configured to emit the visible light when the first data voltage is applied to the display panel during the first frame.

12. The position detecting system of claim 11 , wherein: the position detecting sensor includes a camera configured to capture a portion of the image of the patterns, wherein a position of the camera within the position detecting sensor changes depending on a contact pressure applied to the position detecting sensor.

13. The position detecting system of claim 1 , wherein: the position detecting sensor includes a camera configured to capture a portion of the image of the patterns, wherein a position of the camera within the position detecting sensor changes depending on a contact pressure applied to the position detecting sensor.

14. A method of driving a position detecting system, comprising: providing a backlight unit including a first light emitting unit and a second light emitting unit; applying a first data voltage and a second data voltage to a display panel; turning on the first light emitting unit and turning off the second light emitting unit during a first frame; displaying an image on the display panel based on the first data voltage during the first frame using the first light emitting unit; turning off the first light emitting unit and turning on the second light emitting unit during a second frame; displaying patterns on the display panel based on the second data voltage during the second frame by changing grays of the plurality of pixels using only visible or invisible light of the second light emitting unit, wherein the second light emitting unit is configured to supply either the visible or invisible light to the display panel; and capturing an image of the patterns displayed during the second frame using a position detecting sensor.

15. The method of claim 14 , further comprising: when the position detecting mode is turned off: applying the first data voltage to the display panel, and supplying visible light to the display panel using the first light emitting unit.

16. The method of claim 14 , further comprising: supplying visible light to the display panel using the first light emitting unit during a portion of the second frame when the second data voltage is being applied to the display panel during the second frame.

17. The method of claim 14 , wherein capturing the image of the patterns using the position detecting sensor further comprises: emitting light towards the display panel, and capturing a portion of the light reflected from the display panel, wherein the portion of the reflected light is used to form the image of the patterns.

18. The method of claim 14 , further comprising: supplying infrared light to the display panel using the second light emitting unit when the second data voltage is applied to the display panel; and supplying visible light to the display panel using the first light emitting unit when the first data voltage is applied to the display panel.

19. The method of claim 14 , further comprising: changing a position of a camera disposed within the position detecting sensor based on a contact pressure applied to the position detecting sensor.

20. The method of claim 14 , further comprising: generating touch information by processing the image of the patterns captured by the position detecting sensor.